Differences with a WRP10 and a WRX are about 1.5 degrees of ignition and a slightly leaner fuel map around the mid-range.

Being a Noob what does this exaclty mean?

I have read stats on the WRP10 and it uses abt 1 litre of fuel more per 100 k's than a normal WRX. The higher fuel usage, does this mean it prevents detonation with the upgrade package offered by Subaru with the exhaust?

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MY06 STi